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Teoreticheskaya i Matematicheskaya Fizika, 1972, Volume 13, Number 2, Pages 266–275
(Mi tmf3265)
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This article is cited in 2 scientific papers (total in 2 papers)
Phase transitions in systems with long-range potential
O. A. Ol'khov, B. N. Provotorov, A. I. Rez
Abstract:
The diagram method is used to study phase transitions in systems with $R\to\infty$ Where $R$
is the range of the attractive potential between particles. If the thermodynamic functions
are to be calculated correctly in the neighborhood of a phase transition, it is necessary
to allow for diagrams with many vertices and lines. To allow for their contribution, a
recursion relation is obtained; it relates diagrams of different orders and structures.
The relation is used to estimate the contribution from all the many-vertex diagrams and
to obtain a differential equation for $p(\mu,T)$ that is valid as $R\to\infty$ ($p$ is the pressure, $T$
the temperature, and $\mu$ the chemical potential). The solution is investigated for the example
of the Ising model. In the two-phase region the $s(H)$ curve does not exhibit the unphysical
region with negative susceptibility found in the Curie–Weiss approximation ($s$ is
the polarization, $H$ the magnetic field). It follows from the solution that is found that the
point $R=\infty$ is an essential singularity, so that the thermodynamic functions cannot be expanded
in a Taylor series in powers of $1/R^3$ at points near the phase transition. It is
shown that allowing for many-vertex diagrams is equivalent to having an effective interaction
between the particles of the “all with all” type that is independent of the mutual
separations of the particles.
Received: 07.03.1972
Citation:
O. A. Ol'khov, B. N. Provotorov, A. I. Rez, “Phase transitions in systems with long-range potential”, TMF, 13:2 (1972), 266–275; Theoret. and Math. Phys., 13:2 (1972), 1133–1139
Linking options:
https://www.mathnet.ru/eng/tmf3265 https://www.mathnet.ru/eng/tmf/v13/i2/p266
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Abstract page: | 227 | Full-text PDF : | 84 | References: | 38 | First page: | 1 |
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